#integrationTrigo
Some integrals involving trigonometric functions can be evaluated by using the trigonometric identities. These allow the integrand to be written in an alternative form which may be more amenable to integration. ... use trigonometric identities to integrate sin2 x, cos2 x, and functions of the form sin 3x cos 4x.
MATH EASY, CBSE AND CHSE , IITJEE MATHEMATICS